The first time I saw this dragon illusion I thought it was fake. But after researching a little bit I quickly found out it's as real as it gets. You can print out the same dragon by clicking the link below
The concept in this dragon illusion has been used many times over. It's a simple concept that reverses the head so that when you change the viewing angle the head appears to turn. The idea of this illusion can be used in many different ways, including by making a larger version. Imagine a dragon that stands 8 or 9 feet tall and as you walk around it, the head follows you.
Credit goes to Jerry Andrus as the creator of this wonderful illusion.